Radio and like receiving apparatus



March 19, 1940. Q L E 2,194,169

RADIO AND LIKE RECEIVING APPARATUS I Filed App-i128. 1938 I 4 Sheets-Sheet 1 INVENT'OR ATTORNEY v CLIFFORDMFTCALFE March 19, 1940. c. METCALFE 2,194,169

RADIO AND LIKE RECEIVING APPARATUS Filed April 28, 1938 4 Sheets-Sheet 2 IN VE N TOR c1 m0 M rem; m

ATTORNEY March 19, 1940. c. METCALFE Filed April 28, 1938 RADIO AND LIKE RECEIVING APPARATUS 4 Sheets-Sheii INVENTOR CUFFORD MFTCALFE M141. ATTORNEY March 19, 1940. Q METCALFE I 2,194,169

RADIO AND-LIKE RECEIVING APPARATUS Filed April 28, 1938 4 Sheets-Sheet 4 INVFNTOR c1 IFFORDjIETCAU-E BY ATTORNEY Patented Mar. 19, 1940 PATENT OFFICE RADIO AND. use RECEIVING APPARATUS Clifford Metcalfe, Ruislip, England, assignor to Electric 8; Musical Industries Limited, Hayes, Middlesex, England, a company of Great Britain Application-April'28; 1938, Serial No. 204,720 In Great Britain May 5, 1937 4 Claims.

. correctly tuned for the reception of a desired station.

Heretofore such resonance indicators have been mounted in a fixed position on the receiver and usually in a position remote from the, wavelength scale with which a pointer or cursor cooperates. With such an arrangement difliculties arise in tuning since the resonance indicator remains in its fixed position whilst the cursor moves over its scale. Consequently, in tuning a station it is necessary for the operator to move the cursor to the appropriate position and then redirect his attention to the resonance indicator whilst still operating the control in order to bring the receiver into correct resonance with the signals being received. The fact that the operators attention has to be directed first to the cursorand then to the resonance indicator, tends to cause the operator to tune in stations without reference to the resonance indicator, giving rise to unsatisfactory reproduction.

It is, therefore, the chief object of the present invention to provide an improved tuning arrangement embodying a cathode ray resonance indicator witha view to overcoming this disadvantage.

According to the present invention a combined tuning and resonance indicator for a radioreceiver is provided, said indicator comprising a tuning scale and cursor or pointer co-operating therewith and a cathode ray indicator mounted in proximity to said cursor and so arranged and coupled to the cursor as to move substantially in synchronism with the cursor. By such an arrangement it will be appreciated that since the resonance indicator is mounted in proximity to the pointer and moves therewith, the resonance indicator is in the direct vision of the operator, and, despite the position to which the cursor may be moved, the resonance indicator does not change its relative position thereto. Hence, tuning is facilitated and the tendency for the resonance indicator to be ignored during tuning is substantially avoided.

The resonance indicator" may be carried by a suitable carriage mounted upon a track, the carriage also carrying the cursor or pointer, which is preferably arranged to lie substantially in the axis of symmetry of the luminous. region of the resonance indicator. If desired, in accordance ,5 with a further feature of the invention, the

thei'base plate 52 to the front plate 13.

cursor or pointer might be omitted and the light band of the resonance indicator viewed with referen'ce to the scale to derive a tuning indication. The nature of the invention and the method by which the invention may be carried into practice will be readily understood from the following description in detail, reference being made by way of example to the accompanying drawings, in which: 7

Fig. 1 together with Fig. la which is a continuation of Fig. 1 show a front elevational view of a tuning and resonance indicator according to the invention shown applied to the chassis of a radio receiver, certain parts of the indicator being shown broken away for clarity,

Fig. 2 is aside elevational View particularly in section of the arrangement shown in Figs. 1 and 1a, and

Fig. 3 is a detail perspective view of the frame 2 of the indicator shown in Figs. 1 and 2.

InFigs. l and 210i the drawings H3 represents the. chassis of a radio receiver. Secured on one end of the chassis I0 is a braced frame H which as clearly shown in Fig. 3, comprises a base plate of shallow channel members having up-turned edges as shown at l1, l8 l9 and 2H and the front edge ll of base plate I2 is upturned as shown, for the purpose of providing a means for securing The members l5 and 16 are secured between projections or lugs 22 or 23 on the bracket l4 and theends of edges I7 and 18 on the plate l2. The frame members are preferably united by spot welding.

front plate 13 is apertured as shown at 24, 40

the aperture 24 being almost as long as the front plate and the edges thereof being bent outwardly at right angles as indicated at 25 to form an abutment of small depth the purpose of which will, be apparentlater. Secured on the plate 13 45 at each end of the aperture 24 are upper and lower brackets ZGand- 21 respectively, which preferably span the width of the aperture M and are" secured by spot welding at each end to the I plate i3. Brackets 2 6- and 2!v each carry a lug 50 28'. or 29 as the case may be to which the upper or lower end respectively of a channel sectioned rail L311 is secured, the rail 38 carrying a carriage 31 which is adapted to slide up and down.

onthe rail and to have attached to it a bracket ber IE to accommodate screws or rivets 45, '46

and 4'! respectively by which frame ll is secured on the chassis l9 as clearly shown in Fig. 2. The frame H is preferably secured on the chassis |i with members l2 and it slightly inclined to the horizontal and vertical respectively, as shownin Fig. 2, so that scales mounted on the front of plate l3 as described below, may be viewed readily by an operator. I

Referring now particularly to Figs. 1 and 2 of the drawings, it will be seen that the bracket 32 supports a socket member 50 for a cathode ray indicator 5|, the leads to which are indicated at 52 and the front of which completely fills an aperture in a boss 53 supported on the front of the bracket 32 on extensions 54 and 55 thereof as shown dotted in Fig. 1 and being attached thereto by screws 56 and 51 respectively. Also clamped between the boss 53 and extensions 56 and 5'! of the bracket 32 is a band or curtain 58 preferably of black opaque material which is adapted to be wound on or off rollers 59 or 60 as the case may be, the said rollers being supported in brackets 26 and 21, the curtain passing over guiding spindles 6| and 6|a shown in brackets 26 and 21 in Fig. 2. The band 58 completely fills the aperture 24 in plate l3 except for the area defined by the aperture in boss 53. The rollers 59 and 60 are both spring urged in such direction as to tend to wind the curtain or band 58 on to the respective roller so that the band 56 is maintained in tension between spindles 6| and 6|a the friction of the arrangement being such that neither spring is effective at any time to move the indicator 5| on its bracket 32 and carriage 3! along the slide rail 30.

The resonance indicator 5| single or dual light band type as shown and described in Patent No. 2,051,189 to H. M. Wagner and is arranged so that at resonance the light band or hands appears or appear horizontal, for

example, as indicated at 62 in Fig. 1 and extending through boss 53 is a cursor or pointer 63 which is arranged to co-operate with wave band scales such as 64, 65, 66, 6'! and 68 shown in.

Fig. 1 of which in the present example three scales, namely, scales 64 to 66 are shown as arranged on one side of the aperture 24 on the.

plate It and two scales, namely, scales 6'! and 68 are shown as arranged on the other side of the aperture 24. In the present example scale 64 is an auxiliary scale which is illuminated when the receiver is tuned to the television wavelength, scale 65 is graduated in respect of a short wave. 1 band, scale 66 is graduated in respect of the long .1 f s-i Order to facilitate Working wave band, scale 67 is graduated in respect of the medium wave band and scale 68 is graduatedin respect of a further short wave band. Thescales 64 to 68 are preferably formed ofthick strips of glass or other transparent or translu--. cent material and are supported in brackets 69 and 16 (see Fig. 1) attachedto, the bottom of front plate l3 and maintained vertically by guide 7| secured to the upper end of front plate l3, each scale being separated from the adjacent scale by opaque filler members 12,13 or 14 as may be of the.

the case may be, the scales 64 to 66 being clipped by the in-turned end 15 of guide 1| against the outwardly turned edge 25 of aperture 24 in plate I 3 and scales 61 and 68 being retained in position by the in-turned end 11 of member 1| against the edge 25a formed on the plate l3 on the right-hand side ofaperture 24 as shown in Fig. v1. The inner face of member 1| may be lined with resilient or yielding material such as a felt strip so that when the scales 64 to 68 are slid therethroughthey will be gripped in position." The exposed edges of scales 64 and 68 may also be covered by suitable members similar to the fillermembers- 12, I3 and 14 for example, as shown at 16in- Fig. 1. Carried on the bracket I4 are lamps suchas 8|, 82 and 85 by which the scales64 to,,68,are,edge-lighted in known manner. .Theselamps are preferably mounted in clips on the projections 86 to 90 formed on the bracket 14 as shown in Fig. 3. These lamps 8| to 85 .are arranged to be selectively energised in accordancewith theposition of a wave change switch ,in thev receiver so that only the appropriate scale is illuminated at any given time, thus due to the fact that the scales are separated by opaque fillers only a single scale will receive any substantial illumination at any given time, this scale corresponding to the setting of the wave change switch.

The carriage 3| and bracket 32 with the indicator 5| .is traversed along the slide rail 30 in accordance with the actuation of a tuning knob which isfeither mounted on or geared to the spindle 9| of tuning condenser of the receiver which is mounted in the frame 92 (see Fig. 1a), the mechanical movement being transmitted from the spindle 9| through a pinion 93 mounted on the spindle and a chain 94 which passes from one side. of'pinion 93 over pulley 39 and pulley 35 and is, secured to one side of bracket 32 as shown at95 inFig. 2 and from the other side of pinion 93 over pulley 38 and pulley 36 and is secured to the other side of bracket 32 as shown at '96 irrFig. 2., If desired, of course, the pulleys 35 to 38 may be replaced by pinion wheels which mesh with the chain 94.) Thus, upon actuation of the tuning knob'to move spindle 9| the bracket 32 and carriage 3| will be moved to or fro as the case maybe along the slide rail 30 carrying with them the cathode ray indicator 5| and the cursor 66, thus indicating the tuning condition of the receiver with reference to the appropriate scale-64 to 68. Since the resonance indicator 5| moves with the cursor 63 an operator will never be under the necessity of removing his eyes from the resonance indicator in order to observe the cursor or vice-versa and consequently the operator may readily tune a set to a particular station both with reference to the appropriate scale 64 to 68 and by reference to the indicator 5|.

As mentioned above, the cathode ray indicator 3| may be a single or dual light band indicator withsz zales onleither side an indicator of the latter. type will be used.

However, alternatively, in cases where a single band indicator is used, the indicator may be arranged to be turned through when changing from'operation from a scale located on one side oft-he aperture 24 to ascale' located on the other side of the :aperture- 24. Such an arrangement will be particularly suitable in the case where a receiver had only two ranges one scale being arranged: on" each side of the aperture 24. In

this case, the socket 50 of the resonance indicator 51 might be carried in a suitable bearing and turned therein through the agency of the belt 91' and pulley 98 actuated by the shaft 99 of wave change mechanism (not shown) associated therewith. However, in general it is preferred to use a dual light band resonance indicator rather than a reversible single light band indicator as the added mechanical arrangements necessary have not proved to be very satisfactory in operation.

It will also be appreciated that the cursor or pointer such as 63 shown in Figs. 1 and 2, might be omitted, and the line or lines of light appearing in the resonance indicator when the receiver is turned to resonance used instead of the pointer or cursor to derive an indication with reference to the operative tuning scale.

Furthermore, while a Vertical arrangement of scales 64 to 68 has been shown, other arrangements such as a horizontal arrangement or an arcuate arrangement may be used.

I claim: j

1. In a radio receiver, a combined tuning and resonance indicator comprising in combination a plurality of spaced rectilinear tuning scales defining a track, a carrier movable along said track in response to adjustment of the receiver tuning means, a cursor or pointer mounted on the carrier and adapted to co-operate with each tuning scale, and a cathode ray resonance indicator mounted on said carrier and in proximity to said cursor and so arranged as to move in synchronism with or substantially in synchronism with the movement of the cursor, in such manner that despite movement of the cursor or pointer, the cursor or pointer and the resonance indicator remain together in the direct vision of the operator, said scales being arranged at least one on either side of the track in which the resonance indicator moves. I

2. In a radio receiver, a combined tuning and resonance indicator as set forth in claim 1 in which the resonance indicator is of the dual light band type.

3. In a radio receiver, a. combined tuning and resonance indicator as set. forth in claim 1 in which the resonance indicator is of the single light bandtype and means operated by the wave band switch on said receiver to turn saidindicator about its axis to direct the light band towards a particular scale with which the pointer is co-operating.

4. In a 'radio receiver, a combined tuning and resonance indicator comprising in combination a plurality of spaced rectilinear scale bearing members defining a tracln a carrier movable along said track in response to adjustment of the receiver tuning means, opaque members carried by the carrier'and arranged to cover the track area except for that portion occupied by the carrier, means adapted to be actuated to illuminate selectively said scale bearing members in accordance with the setting of a range changing device in the receiver, a cursor or pointer mounted on the carrier and adapted to co-oper-f ate with each tuning scale, and a cathode ray resonance indicator mounted on said carrier and in proximity to said cursor and so arranged as to move in synchronism with or substantially in synchronism with the movement of the cursor, in such manner that despite movement of the cursor or pointer, the cursor or pointer and the resonance indicator remain together inthe direct vision of the operator, said scale bearing members being arranged at least one on either side of the track in which the resonance indicator moves.

CLIFFORD METCALFE. 

